661420524 has 24 divisors (see below), whose sum is σ = 1544398128. Its totient is φ = 220318720.

The previous prime is 661420481. The next prime is 661420531. The reversal of 661420524 is 425024166.

It is a super-3 number, since 3×661420524³ (a number of 27 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 661420491 and 661420500.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 837 + ... + 36380.

It is an arithmetic number, because the mean of its divisors is an integer number (64349922).

Almost surely, 2^661420524 is an apocalyptic number.

It is an amenable number.

661420524 is an abundant number, since it is smaller than the sum of its proper divisors (882977604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661420524 is a wasteful number, since it uses less digits than its factorization.

661420524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38705 (or 38703 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 661420524 is about 25718.0972079973. The cubic root of 661420524 is about 871.2829637727.

The spelling of 661420524 in words is "six hundred sixty-one million, four hundred twenty thousand, five hundred twenty-four".